Here take back the stuff that I am, nature, knead it back into the dough of being, make of me a bush, a cloud, whatever you will, even a man, only no longer make me.

I have often noticed that when people come to understand a mathematical proposition in some other way than that of the ordinary demonstration, they promptly say, "Oh, I see. That's how it must be." This is a sign that they explain it to themselves from within their own system.

One's first step in wisdom is to question everything - and one's last is to come to terms with everything.

How might letters be most efficiently copied so that the blind might read them with their fingers?

A schoolteacher or professor cannot educate individuals, he educates only species.

We often have need of a profound philosophy to restore to our feelings their original state of innocence, to find our way out of the rubble of things alien to us, to begin to feel for ourselves and to speak ourselves, and I might almost say to exist ourselves.

Brevity: To say at once whatever is to be said.